All posts tagged polyether polyol

TPU with Anti-Biofouling Surface

Patent Title: ANTIFOULING COMPOSITION

Number/Link: WO2017/007899

Applicant/Assignee: BASF

Publication date: 12-jan-2017

“Gist”: TPU containing silicone diol and having microstructured surface

Why it is interesting: Biofouling of surfaces e.g. in the marine environment or of medical implants is a problem. For example the growth of barnacles on the hulls of vessels, subsea cables, pipes and energy generating structures has a significant economic impact. According to this invention, thermoplastic polyurethane articles with a surface energy of about 20 mN/m and a microstructered surface topography show an improved resistance to biofouling. The TPU is produced by incorporating 5-15% on the total composition of a PDMS diol with a OH value of 15 to 150, and by pressing onto the surface a 3D topology with ‘peaks’ and ‘valleys’ of an order of magnitude of 10μm.

Microstructured surface according to the invention

Flexible PU Foams Containing Latent Aldehydes

Patent Title: IMPROVEMENTS RELATING TO POLYURETHANES

Number/Link: WO2017/001543

Applicant/Assignee: Shell

Publication date: 5 january 2017

“Gist”: Flex foams from polyether polyols containing latent aldehydes show improved compression set

Why it is interesting: Aldehydes are a by-product of the alkylene oxide production. These aldehydes need to be removed before the alkylene oxide can be used in the manufacture of polyether polyols because even minor amounts of these impurities are considered undesirable and detrimental for polyol and foam properties. According to this invention, omitting the extra purification step of the alkylene oxide results in polyols with a certain amount of free- and latent aldehydes. (‘latent aldehyde’ being an aldehyde incorporated in the polyether polyol with a labile bond). After removal of the free aldehyde, the polyols with (pref) >150ppm latent aldehydes (mostly propionaldehyde and acetaldehyde) can be used in the preparation of flexible foam with improved wet and dry compression set properties. While the examples indeed show some (but not a dramatic) improvement of compression set, no mention is made of eventual release of the aldehydes in the atmosphere, which (in my opinion) is a much bigger problem than compression set.

Propionaldehyde

Infrared Curable 2K PU Adhesives

Patent Title: LATENT TWO-PART POLYURETHANE ADHESIVES CURABLE WITH INFRARED RADIATION

Number/Link: WO2016/205251 and related cases: WO..5252, WO…5254 and WO..5255

Applicant/Assignee: Dow

Publication date: all published on 22 dec 2016

“Gist”: Two-component PU adhesive using 3 different delayed-action catalysts

Why it is interesting: Two component adhesive systems need a sufficiently long ‘open time’ preferably combined with a fast cure once activated, e.g. by heat. Heat curing using infrared radiation allows for ‘spot curing’ , i.e. curing only predetermined parts of the adhesive such that the assembly can be handled and can be cured completely in a subsequent step. This process is fast and saves energy. The current invention is about IR curable adhesives containing 3 different types of latent catalysts: a latent room temperature organometallic catalyst based on Sn, Zn or Bi added to the polyol component, a phenol-blocked cyclic amidine and a carboxylic acid blocked cyclic amidine. The two latter catalysts can either be included in the polyol or in the isocyanate component. The catalysts used in the examples are dioctyltinthioglycolate, phenol blocked 1,8-diazabicycloundec-7-ene and a carboxilic acid blocked 1,8-diazabicycloundec-7-ene.

1,8-diazabicycloundec-7-ene

Innovation in Polyurethanes

All posts tagged polyether polyol

TPU with Anti-Biofouling Surface

Flexible PU Foams Containing Latent Aldehydes

Infrared Curable 2K PU Adhesives

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